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Studio design environment Adding to the disappointment was that Windows Forms (the NET toolkit for Windows user interfaces) included a model for reusable form templates, although even that was far from perfect Finally, ASPNET 20 fills the gap with a comprehensive new feature called master pages To provide a practical, flexible solution for page templating, a number of requirements must be met: The ability to define a portion of a page separately and reuse it on multiple pages The ability to create a locked-in layout that defines editable regions Pages that reuse this template are then constrained to adding or modifying content in the allowed regions The ability to allow some customization of the elements you reuse on each page The ability to bind a page to a page template declaratively (with no code) or to bind to a page dynamically at runtime.

Figure 2-12. The AJAX Extensions Toolbox node This worked great in terms of only updating the <span> tag and not reloading the whole page, but if you enter fairly large values for X and Y, such as 200 200, several seconds will pass before the table renders without providing any visual queue as to what is going on. This could cause the user to click the button multiple times, thinking that the first click didn t work.

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The ability to design a page that uses a page template with a tool such as Visual Studio Master pages meet all of these requirements They provide a system for reusing templates, a way to limit how templates can be modified, and rich design-time support For this to work, ASPNET defines two new types of pages: master pages and content pages A master page is a page template Like an ordinary ASPNET web page, it can contain any combination of HTML, web controls, and even code In addition, master pages can include content placeholders defined regions that can be modified Each content page references a single master page and acquires its layout and content In addition, the content page can add page-specific content in any of the placeholders In other words, the content page fills in the missing pieces that the master page doesn t define.

Figure 12-2. Process with two threads, both of which contain copies of the process-level token Processes may, alternatively, create threads that run using a different security context than the process itself. ASP.NET uses this type of thread creation for impersonation. In this scenario, the process authenticates an account using that account s credentials, uses the authenticated account to create a new access token, and associates the newly created access token with a thread in the process. This allows that particular thread to access resources using a different security context than the process itself and to access resources to which access would otherwise be denied (see Figure 12-3).

For example, in a typical website, a master page might include a fixed element such as a header and a content placeholder for the rest of the page The content page then acquires the header for free and supplies additional content To take a closer look at how this works, it helps to consider the example presented in the following sections..

To create a master page in Visual Studio, select Website Add New Item from the menu. Select Master Page, give it a filename, and click OK. A master page is similar to an ordinary ASP.NET web form. Like a web form, the master page can include HTML, web controls, and code (either in an inline script block or in a separate file). One difference is that while web forms start with the Page directive, a master page starts with a Master directive that specifies the same information, as shown here: <%@ Master Language="C#" AutoEventWireup="true" CodeFile="SiteTemplate.master.cs" Inherits="SiteTemplate_master" %> Another difference between master pages and ordinary web forms is that master pages can use the ContentPlaceHolder control, which isn t allowed in ordinary pages. The ContentPlaceHolder is a portion of the page where the content page can insert content. When you create a new master page in Visual Studio, you start with a blank page that includes a single ContentPlaceHolder control (see Figure 15-9), although you can add as many as you need.

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